CN101381837A - Traction motor casing new material for high speed motor train set and fabrication technique thereof - Google Patents
Traction motor casing new material for high speed motor train set and fabrication technique thereof Download PDFInfo
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- CN101381837A CN101381837A CNA2008101403076A CN200810140307A CN101381837A CN 101381837 A CN101381837 A CN 101381837A CN A2008101403076 A CNA2008101403076 A CN A2008101403076A CN 200810140307 A CN200810140307 A CN 200810140307A CN 101381837 A CN101381837 A CN 101381837A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title description 13
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000007669 thermal treatment Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- 229910052787 antimony Inorganic materials 0.000 claims description 4
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000005096 rolling process Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 20
- 229910052799 carbon Inorganic materials 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 230000035939 shock Effects 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000271559 Dromaiidae Species 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- APGROBRHKCQTIA-UHFFFAOYSA-N [Mg].[Si].[Fe] Chemical compound [Mg].[Si].[Fe] APGROBRHKCQTIA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a novel material for the casing of a high-speed rolling stock traction motor and the manufacturing process thereof. The mass percentage compositions of a finished product are: 3.35 to 3.80 of C,2.0 to 2.5 of Si,less than or equal to 0.055 of P,less than or equal to 0.025 of S, less than or equal to 0.2 of Mn,less than 0.015 of Ti,less than 0.02 percent of impurity, and the balance of Fe. The low-temperature and impact resistance property of the material is that the impact energy is equal to or more than 12J at the temperatures of 40 DEG C below zero, 50 DEG C below zero and 60 DEG C below zero and the temperature tensile strength at the indoor temperature is more than or equal to 400Mpa and the elongation is more than or equal to 18 percent, and other main mechanical property indices are conforming.
Description
Technical field the present invention relates to a kind of novel casting material and manufacturing technology thereof, particularly a kind of traction motor casing new material for high speed motor train set and manufacturing technology thereof.
Background technology is because EMUs speed per hour height, and it is big to cross over the regional temperature difference, and running environment requires high, comprises that the power traction part of traction electric machine housing must have the low-temperature resistant and shock resistant characteristic.EMU traction electric machine shell material requires QT400-18L, tensile strength 400MPa, and yield strength 〉=240MPa, 18% of unit elongation, nodularization rate 〉=80%, and in the time of-50 ℃, need reach the 12J ballistic work.X ray detects the allowable defect grade must not stipulate grade above in the ASTME446/ASTME186 standard, and can not there be the shrinkage porosite that surpasses regulation ultrasound examination inside.Because of the product structure complexity, the exhaust of large-scale inner chamber core is not smooth, shock-resistant qualified under the cold condition particularly, room temperature tensile strength require and other performance simultaneously up to standard, be the production difficult point of product.
Domestic existing product can not reach the requirement of this standard, and the whole dependence on import of the power traction of China's express locomotive part are introduced by companies such as Siemens, Pang Badi at present.
-50 ℃ of shock resistance EMU traction electric machine case material production technologies also have only a few enterprise to grasp in the world, because its technical monopoly, the experience that can use for reference does not almost have, and domestic do not have enterprise can grasp its production technique especially.
Summary of the invention technical problem to be solved by this invention is, a kind of EMU traction electric machine case material and manufacturing technology thereof are provided, select, control its Chemical Composition by strictness, optimal preparation technology, make the low-temperature resistant and shock resistant performance of product reach-40 ℃ ,-50 ℃ ,-60 ℃ following ballistic works all 〉=12J, room temperature tensile strength all 〉=400MPa, unit elongation all 〉=18%, other main mechanical performance indexs are all up to standard.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of EMU traction electric machine case material is characterized in that: finished product component and mass ratio thereof are C:3.35～3.80, Si:2.0～2.5, and P≤0.055, S≤0.025, Mn≤0.2, Ti＜0.015, impurity＜0.02%, surplus is an iron.
The manufacturing technology of EMU traction electric machine case material is characterized in that:
(1), mass ratio feeds intake: the pig iron 80%, steel scrap 10%, antimony 0.015～0.02%, foundry return 9.985%;
(2), melting: 1500～1520 ℃ of tapping temperatures;
(3), moulding: adopt resin self-setting sand with the moulding of core die, spare under the situation internal soundness zero defect, yield rate height at inhomogeneity of wall thickness.
(4), be poured in the sand mold die cavity, teeming temperature is between 1420～1450 ℃;
(5), sand mold was opened in insulation in 12 hours;
(6), sand removal;
(7), polishing;
(8), thermal treatment: high temperature annealing, atomizing normalizing, tempering, insulation.
Gordian technique wherein:
It is first gordian technique of the present invention that the novel material composition proportion and the mode that breeds are selected.Carbon and silicon are to promote graphite element.In certain speed of cooling and breeding under the condition, the carbon equivalent increase can improve the degree of graphitization of magnesium iron, and the quantity that carbide morphology exists reduces, and the quantity that graphite form exists increases, show as chilling tendency organizationally and reduce, as cast condition cementite and perlite quantity reduce.Because the molten iron super cooling tendency after the spheroidizing increases, for eliminating the as cast condition cementite, magnesium iron needs higher carbon equivalent.Because greying causes iron casting volumetric expansion in crystallisation process, carbon content improves, and volumetric expansion increases, and under the bigger condition of mold stiffness, can make the foundry goods densification, reduces shrinkage porosite, the next increase of the soft condition of casting mold shrinkage porosite.The foundry goods volumetric expansion reaches maximum when mold stiffness is enough big.It is also unnecessary too to carry high-carbon quantity or carbon, the carbon height, and the specific absorption height of magnesium helps nodularization.Flowability was best when magnesium iron reached eutectic composition.Suitably improve carbon equivalent and make it, can improve flowability near eutectic composition.Because graphite is spherical, the weakening effect of matrix is reduced, carry high-carbon quantity mechanical property is not produced tangible disadvantageous effect, but also can improve damping property, antifriction quality.The too high meeting of carbon amount or carbon equivalent causes graphite floatation.The carbon amount improves slightly reduces brittle transition temperature.
When the silicon amount was low, silicon was bigger to graphited influence, and for example the low silicon magnesium iron chilling tendency of high-carbon is bigger, at this moment just can reduce chilling tendency significantly as long as increase silicon on a small quantity.The silicon that adds in the nucleating agent mode is than the silicon in the furnace charge, and graphitizing is more strong, and its influence is far above carbon to 1/3rd of graphitizing ability.If make full use of the saturated state that breeds (after adding nucleating agent, the very fast increase of crystallization nuclei in the molten iron reduces then gradually, and crystallization nuclei reaches maximum quantity, be called the saturated state that breeds), not really high carbon equivalent and a spot of breeding increase silicon and also can eliminate the as cast condition cementite.Inoculation not only promotes greying, and prior meaning is refining eutectic group, improves the graphite roundness.In these cases, the silicon amount increases, and cementite, perlite are reduced, and ferrite increases, eutectic cell refinement, graphite rounding, and impelling strength then improves.Objectionable constituent values such as low manganese, low-sulfur, low-phosphorous, low antimony are for minimizing.
The selection of moulding novel process is second gordian technique of the present invention.Adopt brand-new self-hardening resin sand with core die moulding process, the product design size is good, and is indeformable, any surface finish, and dense structure has accomplished that integrated quality is good under the even situation of inhomogeneity of wall thickness, yield rate is high.
The selection of New Technology of Heat Treatment is the 3rd gordian technique of the present invention.The carrying out of thermal treatment process for improve matrix, mechanical property plays an important role.Adopt the New Technology of Heat Treatment of high temperature annealing, atomizing normalizing, tempering, insulation, guaranteed the accordance of material matrix tissue and main mechanical property.
Behind the product casting complete, through spark-out, Shot Blasting, the testing staff detects its outward appearance, size.The result shows that outward appearance and size aspect meet the demands.To heat-treat according to product requirement, carry out low temperature impact test and other performance test after thermal treatment is finished.The result shows :-40 ℃ ,-50 ℃ ,-60 ℃ ballistic works all 〉=12J, room temperature tensile strength, hardness, chemical ingredients, metallographic are all qualified.
The comparing result of low-temperature impact resistance and main mechanical property and national standard and currently available products is as follows as showing:
The present invention also has following characteristics:
(1) adopt the resin self-setting sand moulding, new casting technique with the core die, has been avoided the problem on deformation of sand mold casting, and exterior contour is clear, any surface finish, and internal soundness is good, and though dense structure is the even integrated quality height of inhomogeneity of wall thickness.
(2)-40 ℃ ,-50 ℃ ,-60 ℃ low temperature are shock-resistant: the shock-resistant foundry goods of low temperature before only be subzero 20 ℃ shock-resistant, product of the present invention has-40 ℃ ,-50 ℃ ,-60 ℃ shock-resistant characteristics, and other performances are all up to standard, satisfied customer demand, filled up domestic blank, the key technical indexes reaches international most advanced level.
(3) big temperature difference environmental product physical dimension no change: the running environment temperature difference of train is bigger, and this product can guarantee the physical dimension no change in this environment, has avoided because the motor burning that the product distortion causes.
(4) the production domesticization degree of propelling high speed motor car: this material product is installed on Beijing-Shanghai high speed Beijing-Tianjin section EMU and the Olympic Games " Harmony " EMUs, has substituted the product of reason Siemens import.
Embodiment further specifies the present invention below in conjunction with embodiment.
Method therefor is ordinary method if no special instructions among the following embodiment, and described degree is the quality percentage composition if no special instructions.
Finished product component and mass ratio thereof are C:3.35～3.80, Si:2.0～2.5, and P≤0.055, S≤0.025, Mn≤0.2, Ti＜0.015, impurity＜0.02%, surplus is an iron.
Manufacture method is as follows:
(1), mass ratio feeds intake: the pig iron 80%, steel scrap 10%, antimony 0.015～0.02%, foundry return 9.985%;
(2), melting: 1500～1520 ℃ of tapping temperatures;
(3), moulding: adopt resin self-setting sand with the moulding of core die.
(4), be poured in the sand mold die cavity, teeming temperature is between 1420～1450 ℃;
(5), insulation was opened sand mold after 12 hours;
(6), sand removal;
(7), polishing;
(8), thermal treatment: high temperature annealing, atomizing normalizing, tempering, insulation.
Not only control the molten metal temperature of stove in the production process, also will control teeming temperature, record teeming temperature, casting ladle also will add insulation cover to reduce the temperature difference in the casting process.Important parts is also wanted every numbering, surveys every actual teeming temperature, every weight record that belongs to covered with gold leaf.Removed and can accomplish that proportioning strictness, smelting temperature are accurate after the artificial factor, the cast product of production can satisfy performance demands.
Be strict controlled on the proportioning in the following scope: chemical ingredients C:3.35～3.80, Si:2.0～2.5, P≤0.055, S≤0.025, Mn≤0.2, Ti＜0.015, impurity＜0.02%
Aspect proportion of raw materials, require steel scrap to eliminate rust, various starting material analytical test compositions, write down the element proportioning one by one, accurate to guarantee each proportioning components of molten iron, inclusion-free, on the proportioning raw materials basis of common Q T400-18L, analyze carbon, silicon, manganese, phosphorus, sulphur, magnesium, the content of rare earth etc., reduce carbon equivalent, improve the nodularization rate, and adjust the rare metal add-on, and aspect teeming temperature, being strict controlled in 1420-1450 ℃, nodulizing agent breeds the content of assurance silicon for twice 2.0%～2.5%, thereby guarantee its shock resistance, and the accordance of every mechanical property.
Claims (2)
1, a kind of traction motor casing new material for high speed motor train set is characterized in that: finished product component and mass ratio thereof are C:3.35～3.80, Si:2.0～2.5, and P≤0.055, S≤0.025, Mn≤0.2, Ti＜0.015, impurity＜0.02%, surplus is an iron.
2, the manufacturing technology of traction motor casing new material for high speed motor train set according to claim 1 is characterized in that:
(1), mass ratio feeds intake: the pig iron 80%, steel scrap 10%, antimony 0.015～0.02%, foundry return 9.985%;
(2), melting: 1500～1520 ℃ of tapping temperatures;
(3), moulding: adopt resin self-setting sand with the moulding of core die.
(4), be poured in the sand mold die cavity, teeming temperature is between 1420～1450 ℃;
(5), insulation was opened sand mold after 12 hours;
(6), sand removal;
(7), polishing;
(8), thermal treatment: high temperature annealing, atomizing normalizing, tempering, insulation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101403076A CN101381837A (en) | 2008-09-27 | 2008-09-27 | Traction motor casing new material for high speed motor train set and fabrication technique thereof |
| CN2009101704966A CN101643877B (en) | 2008-09-27 | 2009-08-22 | Preparation method of high-speed train set with power car pulling motor shell new material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101403076A CN101381837A (en) | 2008-09-27 | 2008-09-27 | Traction motor casing new material for high speed motor train set and fabrication technique thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN101381837A true CN101381837A (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101403076A Pending CN101381837A (en) | 2008-09-27 | 2008-09-27 | Traction motor casing new material for high speed motor train set and fabrication technique thereof |
| CN2009101704966A Expired - Fee Related CN101643877B (en) | 2008-09-27 | 2009-08-22 | Preparation method of high-speed train set with power car pulling motor shell new material |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101704966A Expired - Fee Related CN101643877B (en) | 2008-09-27 | 2009-08-22 | Preparation method of high-speed train set with power car pulling motor shell new material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101643877B (en) * | 2008-09-27 | 2011-08-10 | 莱州新忠耀机械有限公司 | Preparation method of high-speed train set with power car pulling motor shell new material |
| CN104032208A (en) * | 2013-03-08 | 2014-09-10 | Lg电子株式会社 | Graphite cast iron for orbital or fixed scroll and manufacturing method of orbital or fixed scroll using the same |
| CN105506445A (en) * | 2015-12-21 | 2016-04-20 | 常熟市制冷压缩机铸件厂 | Cast alloy for housing of refrigerator compressor |
| CN105903891A (en) * | 2010-01-11 | 2016-08-31 | 贝德罗工业有限责任公司 | Use of no-bake mold process to manufacture railroad couplers |
| CN107470560A (en) * | 2017-08-28 | 2017-12-15 | 安徽省含山县潮林铸管厂（普通合伙） | A kind of casting method for preventing complex motor casing from deforming |
| CN117260398A (en) * | 2023-08-14 | 2023-12-22 | 河南钱潮智造有限公司 | Automatic brake caliper casting machining process |
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| CN102104302A (en) * | 2010-12-28 | 2011-06-22 | 陈长根 | Method for casting marine motor shell by ductile cast iron |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86107996A (en) * | 1986-11-29 | 1988-06-08 | 天津市塘沽阀门厂 | Low-manganese high-strength cast iron and melting technology thereof |
| CN101381837A (en) * | 2008-09-27 | 2009-03-11 | 莱州新忠耀机械有限公司 | Traction motor casing new material for high speed motor train set and fabrication technique thereof |
-
2008
- 2008-09-27 CN CNA2008101403076A patent/CN101381837A/en active Pending
-
2009
- 2009-08-22 CN CN2009101704966A patent/CN101643877B/en not_active Expired - Fee Related
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| CN101643877B (en) * | 2008-09-27 | 2011-08-10 | 莱州新忠耀机械有限公司 | Preparation method of high-speed train set with power car pulling motor shell new material |
| CN105903891A (en) * | 2010-01-11 | 2016-08-31 | 贝德罗工业有限责任公司 | Use of no-bake mold process to manufacture railroad couplers |
| CN105903891B (en) * | 2010-01-11 | 2021-01-12 | 贝德罗工业有限责任公司 | Manufacturing a rail connector using a no-bake mold process |
| CN104032208A (en) * | 2013-03-08 | 2014-09-10 | Lg电子株式会社 | Graphite cast iron for orbital or fixed scroll and manufacturing method of orbital or fixed scroll using the same |
| CN105506445A (en) * | 2015-12-21 | 2016-04-20 | 常熟市制冷压缩机铸件厂 | Cast alloy for housing of refrigerator compressor |
| CN107470560A (en) * | 2017-08-28 | 2017-12-15 | 安徽省含山县潮林铸管厂（普通合伙） | A kind of casting method for preventing complex motor casing from deforming |
| CN117260398A (en) * | 2023-08-14 | 2023-12-22 | 河南钱潮智造有限公司 | Automatic brake caliper casting machining process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101643877A (en) | 2010-02-10 |
| CN101643877B (en) | 2011-08-10 |
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